Application Note, V 1.0, Feb. 2004 AP16015 C16x M e s u r e m e n t o n th e C 1 6 6 Fam i ly . Micr ocon tro l lers N e v e r s t o p t h i n k i n g . C16x Revision History: 2004-02 V 1.0 Previous Version: Page Subjects (major changes since last revision) All Updated Layout to Infineon Corporate Design, updated release to 1.0, Content unchanged! Controller Area Network (CAN): License of Robert Bosch GmbH We Listen to Your Comments Any information within this document that you feel is wrong, unclear or missing at all? Your feedback will help us to continuously improve the quality of this document. Please send your proposal (including a reference to this document) to: [email protected] Edition 2004-02 Published by Infineon Technologies AG 81726 München, Germany © Infineon Technologies AG 2006. All Rights Reserved. LEGAL DISCLAIMER THE INFORMATION GIVEN IN THIS APPLICATION NOTE IS GIVEN AS A HINT FOR THE IMPLEMENTATION OF THE INFINEON TECHNOLOGIES COMPONENT ONLY AND SHALL NOT BE REGARDED AS ANY DESCRIPTION OR WARRANTY OF A CERTAIN FUNCTIONALITY, CONDITION OR QUALITY OF THE INFINEON TECHNOLOGIES COMPONENT. THE RECIPIENT OF THIS APPLICATION NOTE MUST VERIFY ANY FUNCTION DESCRIBED HEREIN IN THE REAL APPLICATION. INFINEON TECHNOLOGIES HEREBY DISCLAIMS ANY AND ALL WARRANTIES AND LIABILITIES OF ANY KIND (INCLUDING WITHOUT LIMITATION WARRANTIES OF NON-INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OF ANY THIRD PARTY) WITH RESPECT TO ANY AND ALL INFORMATION GIVEN IN THIS APPLICATION NOTE. Information For further information on technology, delivery terms and conditions and prices please contact your nearest Infineon Technologies Office (www.infineon.com). Warnings Due to technical requirements components may contain dangerous substances. For information on the types in question please contact your nearest Infineon Technologies Office. Infineon Technologies Components may only be used in life-support devices or systems with the express written approval of Infineon Technologies, if a failure of such components can reasonably be expected to cause the failure of that life-support device or system, or to affect the safety or effectiveness of that device or system. Life support devices or systems are intended to be implanted in the human body, or to support and/or maintain and sustain and/or protect human life. If they fail, it is reasonable to assume that the health of the user or other persons may be endangered. AP16015 Mesurement on the C166 Family Table of Contents Table of Contents 1 Page I/O - “Scope Probes Connected to an Output Pin” ........................................ 2 Application Note 3 V 1.0, 2004-02 AP16015 Mesurement on the C166 Family I/O - “Scope Probes Connected to an Output Pin” 1 I/O - “Scope Probes Connected to an Output Pin” Siemens’ C166-Family is manufactured in advanced CMOS technology to achieve high performance at low power consumption. There are no open drain outputs at standard data and address busses and control signals like RD# or WR#. Output drivers have been designed for full TTL compatibility (output LOW voltage max. 0.4V @ 2.4mA / 1.6mA and HIGH voltage min. 2.4V @ -2.4mA / -1.6mA; refer to User’s Manual for respective specification). Problems may occur if under test conditions long wires or not suitable scope probes are connected to an output pin. These devices will bring several capacitances and inductances into the system which results in static and/or dynamic overload and flatten signal edges. Signals will appear delayed at their destination e.g. WR# pin of on-board memory causing serious timing problems or system failures. Additional delay times can be easily calculated by tadd = Cadd VHIGH - VLOW Iout Assuming a 2.4mA output driver (Iout) and a LOW to HIGH voltage difference of 2V (VHIGH - VLOW) a cable or probe capacitance of 20pF will show an additional signal delay time of approximately 17nsec which will be too much in almost all cases. Application Note 4 V 1.0, 2004-02 AP16015 Mesurement on the C166 Family I/O - “Scope Probes Connected to an Output Pin” 1:1 Passive Scope Probe external C166 device output pin on board >>20pF !! shielded cable 1:10 Scope Probe C166 external device output pin C on board 9R typ. 5 pF R shielded cable 9C Figure 1 Scope Probes Connected to an Output Pin Different scope probes connected to signal lines influences the dynamic load of line drivers. . Application Note 5 V 1.0, 2004-02 http://www.infineon.com Published by Infineon Technologies AG